Put 2 Tbsp. oil, onion and pepper in a large skillet; cook over medium heat, stirring occasionally, until onion is softened and golden, about 6 minutes. Add about half of spinach leaves and cook, tossing and adding more spinach by handfuls, until all spinach is wilted. Stir in feta.
Preheat oven to 350°F. Line a baking sheet with parchment paper or foil. Unroll bread dough on a work surface and cut into 4 equal pieces; place on baking sheet. Spoon equal portions of spinach mixture onto center of each piece of dough. Fold dough over filling to make triangles; crimp edges to seal pies. Slice a hole in top of each pie to let hot air escape while cooking; brush top lightly with remaining 1 Tbsp. oil.
Bake spinach pies until golden on top and bottom, 25 to 30 minutes. Let cool slightly before serving.
Absolutely delicious! I would make this again and again. It's so versatile. I was thinking about all of the different combinations I can come up with and the possibilites are endless. These make great lunches or dinners with these ingredients but could easily be turned into a breakfast entree. I ate this as is. Very easy to make and cleanup was practically none. Before I could get through half of this I was already feeling full. Yummy!
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